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When the time is folded, time_hash() uses DATE_xxx() macros, instead of TIME_xxx() macros, and so reads microseconds from the wrong bytes.
Bug introduced by the implementation of the PEP 495 (Local Time Disambiguation).
#define PyDateTime_DATE_GET_MICROSECOND(o) \
 ((((PyDateTime_DateTime*)o)->data[7] << 16) | \
 (((PyDateTime_DateTime*)o)->data[8] << 8) | \
 ((PyDateTime_DateTime*)o)->data[9])
#define PyDateTime_TIME_GET_MICROSECOND(o) \
 ((((PyDateTime_Time*)o)->data[3] << 16) | \
 (((PyDateTime_Time*)o)->data[4] << 8) | \
 ((PyDateTime_Time*)o)->data[5])
Attached patch fixes time_hash().
I guess that it's a dummy copy-paste issue.